US4621124A - Catalyst system for the polymerization of ethylene - Google Patents

Catalyst system for the polymerization of ethylene Download PDF

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Publication number
US4621124A
US4621124A US06/775,711 US77571185A US4621124A US 4621124 A US4621124 A US 4621124A US 77571185 A US77571185 A US 77571185A US 4621124 A US4621124 A US 4621124A
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United States
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sub
titanium
compound
ethylene
reaction zone
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Expired - Fee Related
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US06/775,711
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English (en)
Inventor
Jean-Marie Neyer
Jean-Pierre Machon
Karel Bujadoux
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Norsolor SA
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Chimique des Charbonnages SA
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Assigned to NORSOLOR, SOCIETE ANONYME reassignment NORSOLOR, SOCIETE ANONYME ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SOCIETE CHIMIQUE DES CHARBONNAGES, SOCIETE ANONYME
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F10/02—Ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00—Polymerisation catalysts
    • C08F4/02—Carriers therefor
    • C08F4/022—Magnesium halide as support anhydrous or hydrated or complexed by means of a Lewis base for Ziegler-type catalysts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S526/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S526/902—Monomer polymerized in bulk in presence of transition metal containing catalyst
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S526/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S526/904—Monomer polymerized in presence of transition metal containing catalyst at least part of which is supported on a polymer, e.g. prepolymerized catalysts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S526/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S526/906—Comminution of transition metal containing catalyst
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S526/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S526/919—Catalyst injection technique in addition polymerization processes

Definitions

  • the present invention relates to an improved process for the polymerization of ethylene under high pressures and, more particularly, to a process for the polymerization of ethylene at high pressures and temperatures with Ziegler type catalysts.
  • a catalyst system comprising first, a halogen compound of a transition metal such as titanium trichloride, optionally cocrystallized with aluminum trichloride, and, secondly, an activator such as an alkyl-aluminum or an alkylsiloxalane.
  • the present invention comprises in a process for the polymerization of ethylene at a temperature of between 180° and 340° C. and under a pressure of between 200 and 2500 bars in at least one reaction zone, the improvement of polymerizing the ethylene in the presence of a catalyst system comprising (A) an activator selected from the group consisting of alkyl-aluminums and alkylsiloxalanes and (B) a compound of the formula:
  • a is from 2 to 3;
  • y is 2 or more
  • z is from 0 to 1/3;
  • b is from 0 to 1;
  • R is an aliphatic or aromatic hydrocarbon radical.
  • the proportions of (A) and (B) are chosen so as to give an atomic ratio of Al/Ti of between 1 and 10.
  • the process is applicable not only to the production of polyethylene but also to the co-polymerization of ethylene with a comonomer such as propylene or 1-butene and to the terpolylmerization of ethylene with, for example, propylene and a diene.
  • the process of polymerizing the ethylene in the presence of this new and improved catalyst system can be carried out in a known manner in a stirred reactor possessing at least one reaction zone in which the residence time of the catalyst in each reaction zone of the reactor is from 1 to 150 seconds.
  • the process can be carried out in several reactors arranged in series. It can also be carried out using an inert diluent such as propane or butane so as to ensure the homogeneity of the reaction mixture in the reaction zone, though the same effect may be achieved by a rise in temperature, without hazard to the properties of the resin.
  • alkyl-aluminum compounds as activators are trioctylaluminum, chlorodiethylaluminum, triethylaluminum, tri-n-butylaluminum, tri-isobutylaluminum and tri-isoprenyl aluminum.
  • Suitable alkylsiloxalanes as activators in the catalyst system of the present invention are compounds of formula (R 1 R 2 R 3 ) Si--O--Al (R 4 R 5 ), wherein R 1 , R 2 , R 3 and R 4 are saturated hydrocarbon radicals of from 1 to 10 carbon atoms and R 5 may be the same or --O--Si (R 1 R 2 R 3 ).
  • Exemplary of such compounds are trimethyl-dimethylsiloxalane, trimethyl-dioctyl-siloxalane and dimethylethyl-diethyl siloxalane.
  • Mg is from 12 to 28%
  • Ti is from 0.5 to 13%
  • Al is from 0 to 3%
  • the device comprises a pump A for injecting, for example, violet titanium trichloride under high pressure through a pipe 1 into a reactor 3, and a pump B for injecting, for example, anhydrous magnesium chloride and activator A under high pressure through pipe 2 into the reactor 3.
  • the pipes 1 and 2 open concentrically into reactor 3 which is fed with fresh ethylene and with recycled ethylene through pipes 4 and 5.
  • the device can be further modified by joining the pipes 1 and 2 before they enter reactor 3. This provides greater flexibility in regulating the formulation of the compound (B) of the catalyst system and consequently for obtaining resins possessing certain properties.
  • the "in situ" production of the compound (B) is favored by the thermal shock which the catalyst components undergo at entry into the reactor. Because of the approach of the magnesium atoms, this shock leads to a modification of the configuration of the titanium atoms, which imparts a lower dimerising power to the catalyst system.
  • the regulation of the melt index and the width of the molecular weight distribution no longer depend solely on the hydrogen concentration, so there is greater flexibility in the manufacture of resins intended for various applications. Also, it is possible to operate the extreme reaction zones of a reactor at very different temperatures without fear of the formation of waxes or of excessively high molecular weights in these zones. Further, the last reaction zone can, while maintaining the same quality of resin, be operated at a temperature which is 40° to 80° C. above the usual temperature, resulting in an economically significant improvement in the degree of conversion.
  • ethylene is polymerized in a stirred reactor comprising three zones; each zone being characterized by a temperature T° C. and by its proportion ⁇ of the total feed flow.
  • the catalyst comprises a titanium trichloride pre-activated with trioctylaluminum until an atomic ratio of Al/Ti of 1 is reached. It is then prepolymerized with 1-hexene in a hexene/Ti ratio of 3 to 5 mols/atom and finally activated with trioctylaluminum until a final atomic ratio of Al/Ti of 3 is reached.
  • Example 1 violet titanium trichloride cocrystalized with aluminum trichloride is used and in Example 5, a brown titanium trichloride is used; obtained by reducing titanium tetrachloride at 0° C. with triethyl-aluminum followed by filtering and washing with methyl-cyclohexane.
  • the reactor is of a cylindrical autoclave reactor; each reaction zone being equipped with injectors for the catalyst and for ethylene, and with two thermocouples.
  • the reaction zones are of identical volume and the mean residence times through the whole reactor are between 25 and 60 seconds.
  • Hydrogen (H 2 ) is employed as the transfer agent and propane (C 3 H 8 ) as the diluent. Table I below summarizes the reaction conditions of the examples.
  • Table II below gives the polymerization results, including: the catalytic yield in kilograms of polymer per milliatom of titanium; the percentage of conversion; the melt index (MI) in g/10 mins measured according to Standard Specification ASTM-D1238 73; the density ( ⁇ ) in g/cm 3 measured at 23° C. on samples which have been reheated for 1 hour at 150° C. and cooled at the rate of 50° C./hour; the % elongation at break (EB); the tensile strength (TS) in kg/cm 2 ; the flexion elasticity modulus (FEM) in kg/cm 2 ; and the content of 1-butene (C 4 H 8 ) by weight.
  • MI melt index
  • ⁇ density
  • TS tensile strength
  • FEM flexion elasticity modulus
  • Titanium tetrachloride is added, at 0° C., to a suspension of n-butyl-magnesium in a saturated C 11 -C 12 hydrocarbon mixture until an atomic ratio of Ti/Mg of about 0.35 is obtained. The mixture is then heated at 130° C. for four hours. After filtration and several washes, the composition by weight of the dry solid catalyst is as follows:
  • the solid catalyst suspended in methylcyclohexane, is first preactivated with trioctylaluminum until the atomic ratio of Al/Ti is 1; it is then prepolymerized with 1-hexene using a molar ratio of hexene/Ti of 2 and finally activated by trioctylaluminum until the atomic ratio of Al/Ti is 3.
  • a solid catalyst is prepared by co-grinding anhydrous magnesium chloride and a violet titanium trichloride sold by TOHO TITANIUM under the trademark TAC 191. Its composition by weight is as follows:
  • the solid catalyst is suspended in methylcyclohexane, and is activated as in Examples 6 and 7.
  • polymerization is carried out in a stirred autoclave reactor having a reaction zone operating at 250° C. under a pressure of 1,500 bars and equipped with a device as shown in the drawing. Hydrogen is employed, as the transfer agent, at the rate of 0.2% by volume.
  • Pump A injects violet titanium trichloride TAC 191 (see Examples 8-10) and pump B injects the anhydrous magnesium chloride at rates such that the composition by weight of the catalyst constituent (B) formed "in situ" is as follows:
  • Trioctylaluminum as the activator is injected also by pump B so as to give an atomic ratio of Al/Ti of 3 and the residence time of the catalyst system in the reactor is 30 seconds.
  • the content by weight of polyethylene (PE) having a molecular weight less than 5,000 is 9.8%.
  • a solid catalyst is prepared by co-grinding anhydrous magnesium chloride and violet titanium trichloride TAC 191.
  • composition by weight is as follows:
  • the solid catalyst in suspension in methylcyclohexane, is activated as in Examples 6 and 7.
  • Polymerization is carried out in solution in methylcyclohexane in the same reactor as in Examples 1 to 5.
  • Hydrogen is employed as the transfer agent, and the temperature is 250° C.
  • the residence time of the catalytic system in the reactor is 30 seconds.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Polymerisation Methods In General (AREA)
US06/775,711 1976-02-25 1985-09-16 Catalyst system for the polymerization of ethylene Expired - Fee Related US4621124A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7605258A FR2342306A1 (fr) 1976-02-25 1976-02-25 Procede ameliore de polymerisation ionique de l'ethylene sous haute pression
FR7605258 1976-02-25

Related Parent Applications (1)

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US06177432 Continuation 1980-08-12

Publications (1)

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Country Status (16)

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US (1) US4621124A (xx)
JP (1) JPS5919571B2 (xx)
AT (1) AT355802B (xx)
BE (1) BE851644A (xx)
BR (1) BR7701113A (xx)
CA (1) CA1077198A (xx)
CS (1) CS207384B2 (xx)
DE (1) DE2708010A1 (xx)
ES (1) ES456321A1 (xx)
FR (1) FR2342306A1 (xx)
GB (1) GB1543103A (xx)
IT (1) IT1072665B (xx)
LU (1) LU76832A1 (xx)
NL (1) NL7701954A (xx)
NO (1) NO148927C (xx)
PT (1) PT66185B (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5571877A (en) * 1986-04-17 1996-11-05 Enichem Base S.P.A. Method of preparing low or medium-density straight-chain polyethylene, and catalysts suitable for this purpose

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2399445A1 (fr) * 1977-08-01 1979-03-02 Charbonnages Ste Chimique Procede controle de polymerisation de l'ethylene par injection separee des constituants catalytiques
FR2424760A1 (fr) * 1978-05-05 1979-11-30 Charbonnages Ste Chimique Catalyseurs comprenant du magnesium et un metal de transition
FR2451924A1 (fr) * 1979-03-23 1980-10-17 Charbonnages Ste Chimique Copolymeres de l'ethylene capables d'etre transformes en films et procede de production desdits copolymeres
JPS56122807A (en) * 1980-03-04 1981-09-26 Mitsubishi Petrochem Co Ltd Polymerization of ethylene
JPS56161407A (en) * 1980-05-17 1981-12-11 Mitsubishi Petrochem Co Ltd Polymerization of ethylene
JPS56161406A (en) * 1980-05-17 1981-12-11 Mitsubishi Petrochem Co Ltd Polymerization of ethylene
DE3027885A1 (de) * 1979-07-24 1981-02-12 Mitsubishi Petrochemical Co Polymerisation von ethylen
FR2464922A1 (fr) * 1979-09-13 1981-03-20 Charbonnages Ste Chimique Procede de reduction d'halogenures metalliques en phase vapeur par des composes organomagnesiens solides et produits reduits obtenus
FR2472581A1 (fr) * 1979-12-28 1981-07-03 Charbonnages Ste Chimique Catalyseurs de polymerisation de l'ethylene comprenant des composes de plusieurs metaux de transition, et procede de polymerisation utilisant lesdits catalyseurs.
IT1130243B (it) * 1980-02-01 1986-06-11 Anic Spa Composizione chimica a base di titanio trialogenuro,metodo per la sua preparazione e processo di polimerizzazione o copolimerizzazione di composti insaturi impiegante la stessa
FR2483430B1 (fr) * 1980-05-28 1985-06-07 Charbonnages Ste Chimique Copolymeres de l'ethylene capables d'etre moules et/ou injectes et un procede pour leur production
FR2509315A1 (fr) * 1981-07-10 1983-01-14 Charbonnages Ste Chimique Copolymeres heterogenes de l'ethylene pour la fabrication de films
JPS58125706A (ja) * 1982-01-22 1983-07-26 Mitsubishi Petrochem Co Ltd エチレンの重合法
DE3504808A1 (de) * 1985-02-13 1986-08-14 Studiengesellschaft Kohle mbH, 4330 Mülheim Verfahren zur herstellung von polyolefinen, polydienen und deren copolymerisaten
ES8609375A1 (es) * 1985-07-23 1986-07-16 Empresa Nac Petroleo Procedimiento perfeccionado de polimerizacion y copolimeri- zacion de etileno a presiones y temperaturas elevadas

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1292853A (en) * 1968-11-21 1972-10-18 Montedison Spa Polymerization of olefins
GB1314258A (en) * 1969-10-24 1973-04-18 Mistui Petrochemical Ind Ltd Polymerisation of olefins and catalyst therefor
DE2350795A1 (de) * 1972-10-13 1974-04-25 Ethylene Plastique Sa Verfahren zur polymerisation von aethylen unter verwendung eines neuen katalysators
GB1391322A (en) * 1971-04-20 1975-04-23 Montedison Spa Olefin polymerzation catalysts
US3892717A (en) * 1971-05-25 1975-07-01 Mitsui Petrochemical Ind Process for producing maleic acid modified polymerized ethylene wax
GB1414883A (en) * 1972-09-18 1975-11-19 Naphtachimie Sa Method of polymerising olefins by means of pre-activated catalysts
GB1441115A (en) * 1972-10-13 1976-06-30 Ethylene Plastique Sa Process for the preparation of ethylene polymers of controlled density
US3969332A (en) * 1973-08-21 1976-07-13 Ethylene Plastique Polymerization of ethylene

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE741038A (xx) * 1968-10-30 1970-04-30
FR2202898B1 (xx) * 1972-10-13 1976-03-26 Ethylene Plastique Sa

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1292853A (en) * 1968-11-21 1972-10-18 Montedison Spa Polymerization of olefins
GB1314258A (en) * 1969-10-24 1973-04-18 Mistui Petrochemical Ind Ltd Polymerisation of olefins and catalyst therefor
GB1391322A (en) * 1971-04-20 1975-04-23 Montedison Spa Olefin polymerzation catalysts
US3892717A (en) * 1971-05-25 1975-07-01 Mitsui Petrochemical Ind Process for producing maleic acid modified polymerized ethylene wax
GB1414883A (en) * 1972-09-18 1975-11-19 Naphtachimie Sa Method of polymerising olefins by means of pre-activated catalysts
DE2350795A1 (de) * 1972-10-13 1974-04-25 Ethylene Plastique Sa Verfahren zur polymerisation von aethylen unter verwendung eines neuen katalysators
GB1441115A (en) * 1972-10-13 1976-06-30 Ethylene Plastique Sa Process for the preparation of ethylene polymers of controlled density
US3969332A (en) * 1973-08-21 1976-07-13 Ethylene Plastique Polymerization of ethylene

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5571877A (en) * 1986-04-17 1996-11-05 Enichem Base S.P.A. Method of preparing low or medium-density straight-chain polyethylene, and catalysts suitable for this purpose

Also Published As

Publication number Publication date
BR7701113A (pt) 1977-10-18
NO770621L (no) 1977-08-26
NO148927C (no) 1984-01-11
FR2342306A1 (fr) 1977-09-23
JPS52103485A (en) 1977-08-30
FR2342306B1 (xx) 1980-05-30
NL7701954A (nl) 1977-08-29
AT355802B (de) 1980-03-25
ATA122977A (de) 1979-08-15
LU76832A1 (xx) 1977-07-11
CS207384B2 (en) 1981-07-31
IT1072665B (it) 1985-04-10
GB1543103A (en) 1979-03-28
BE851644A (fr) 1977-08-22
CA1077198A (en) 1980-05-06
DE2708010A1 (de) 1977-09-01
JPS5919571B2 (ja) 1984-05-07
ES456321A1 (es) 1978-01-16
NO148927B (no) 1983-10-03
PT66185A (fr) 1977-03-01
PT66185B (fr) 1978-07-11

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